Digital cameras forum: 2x teleconverter for canon 40d

Hello.I have another quick question. i recently purchased a 2x teleconverter (made by Canon) to use with my 40D. Are there any tips or tricks to use with this? I am getting a good zoom when I look through the lens, but my pictures are blurred.Tim

There are numerous posts on dpreview saying that the 2x teleconverter produces very soft pictures, and the lens have trouble focusing with them on. Most people, from what I've read, will only go as high as the 1.4x converter.

You're right kiddpeat, on your lens it does a pretty good job of autofocusing and because your lens is so sharp, it wouldn't do much damage on that front.

Unfortunately, he probably doesn't have a $1600 lens. The Canon 2x converter will only allow autofocus on lenses with a max aperture of 2.8 or faster (2.0, 1.8, etc). Which means for most people with telephoto lens that it will not allow autofocusing. Also, a lesser len's weaknesses show much more with the teleconverter.

you're using the correct shutter speed and ISO. When use any lense with an extender, the focal length will be twice for what you normally shoot. In addition, for most telephoto lenses you'll loose 1-2 F-stops when shooting the same condition picture due to the larger gap between lense and sensor.

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